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Singer 20U-105C - User Manual

Singer 20U-105C
58 pages
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Zigzag Sewing Machine
Instruction Maqnual
and Parts List
SINGER and the Cameo "S" Design are exclusive trademarks of The Singer Company Limited S.à r.l. or its Af liates.
©2017 The Singer Company Limited S.à r.l. or its Afliates. All rights reserved.
20
U
105 / 105C
125 / 125C

Table of Contents

Questions and Answers

  • E
    Elaine ReedAug 12, 2025
    Why does the needle thread keep breaking on my Singer 20U-105C?
    • J
      John VasquezAug 12, 2025
      The needle thread may break due to several reasons. Ensure the machine is properly threaded and the needle thread tension is correctly adjusted. Remove any lint or fluff from the thread guides or tension disc area, bobbin case, and hook. Check if the needle is bent, blunt, or incorrectly inserted; replace or re-insert as needed. Verify that the needle size is appropriate for the thread and fabric, and try changing the thread if it's of poor quality.
  • L
    Lisa ElliottAug 16, 2025
    How to fix skipped stitches on Singer 20U-105C?
    • P
      Patrick HunterAug 16, 2025
      Skipped stitches can occur if the needle is not inserted correctly, is bent, or has a blunt point. Ensure the needle is properly inserted or replace it with a new one. Also, make sure that the size of the needle and thread are suitable for the fabric and that the threading is correct.
  • P
    Patrick WagnerAug 19, 2025
    What to do if bobbin thread breaks on Singer Sewing Machine?
    • S
      Sean HenryAug 19, 2025
      If the bobbin thread breaks, check if the bobbin is threaded correctly and untangle any thread from the bobbin case and hook. Adjust the needle and bobbin case thread tension, and ensure the bobbin rotates smoothly by checking if the bobbin thread is wound correctly.
  • W
    williamscarlAug 23, 2025
    What to do if my Singer 20U-105C Sewing Machine fails to start?
    • T
      Tamara JohnsonAug 25, 2025
      If the machine fails to start, ensure the electrical plugs are properly connected and turn on the power switch. Also, check that the power and light switch are turned on and connect the plug to a power source.
  • C
    christopherthomasAug 27, 2025
    How to fix fabric not feeding through Singer 20U-105C Sewing Machine?
    • J
      Jeffery JonesAug 27, 2025
      If the fabric fails to feed, lengthen the stitch length by adjusting the feed regulating dial and adjust the presser foot pressure properly.
  • K
    Kelli RiveraAug 31, 2025
    What to do if the needle breaks on my Singer 20U-105C Sewing Machine?
    • L
      lee45Aug 31, 2025
      A needle can break for several reasons. Make sure the needle is installed correctly and is not bent. Replace it if it is. Also, ensure you're using the correct needle size for the fabric and tighten the needle clamping screw. Avoid pulling the fabric while sewing.
  • V
    Victoria CabreraSep 3, 2025
    Why is my fabric puckering when using my Singer 20U-105C?
    • J
      Jasmine RiveraSep 3, 2025
      Fabric puckering can occur if the needle threading is incorrect, the needle point is blunt, or the thread tension is too tight. Correct the needle threading, replace the needle if it's blunt, and properly adjust the needle tension.
  • S
    Sharon ParkSep 7, 2025
    How to reduce rotating heavy noise in Singer 20U-105C Sewing Machine?
    • E
      Eric BarrettSep 7, 2025
      To reduce rotating heavy noise, remove any lint or fluff from the feed dog and the rotating hook.

Summary

Safety Instructions

Important Safety Instructions

General safety procedures to follow when operating the machine.

For Safe Operation

Specific safety precautions to avoid electric shock and injuries.

Product Description and Machine Specification

Product Description

Overview and image of the Zigzag Sewing Machine 20U series.

Machine Specification

Technical specifications of the sewing machine models.

Motor, Motor Pulley and V-Belt Specifications

Details about the motor, pulley, and V-belt specifications.

Relationship between Zigzag Bight and Maximum Speed

Correlation between zigzag stitch width and maximum operating speed.

Setup and Adjustment Instructions

Table Cut-Out Drawing

Provides dimensions for cutting a table to fit the sewing machine.

Oil Reservoir Installation

Steps and diagrams for installing the oil reservoir.

Belt Cover Installation

Instructions for correctly installing the machine and motor belt covers.

Lubrication

Guidance on lubricating various parts of the sewing machine.

Needle and Thread

Guidelines for selecting appropriate needles and threads for different materials.

Inserting the Needle

Step-by-step instructions for correctly inserting a needle.

Bobbin Case Attachment

How to correctly attach the bobbin case to the machine.

Bobbin Thread Winding

Procedure for winding thread onto the bobbin, including tension adjustment.

Bobbin Case Threading and Replacement

Instructions for threading the bobbin case and replacing it.

Machine Threading

Step-by-step guide for threading the sewing machine head.

Stitch Length Adjustment

How to adjust the stitch length and reverse stitch length.

Presser Foot Pressure Adjustment

Method for adjusting the pressure applied by the presser foot.

Needle Thread Tension Adjustment

How to adjust the tension of the needle thread.

Thread Take-up Spring Adjustment

Adjusting the pressure and stroke of the thread take-up spring.

Bobbin Thread Tension Adjustment

Adjusting the tension of the bobbin thread.

Needle Position Selector

How to select the needle position for different stitching types.

Stitch Width Regulator

Explains the function of the stitch width regulating lever.

Zigzag Stitch Width Control

How to control the width of zigzag stitches using thumb screws.

Needle Bar Frame Clamp Device

How to clamp the needle bar frame for straight stitching.

Straight and Zigzag Stitch Fitting

Details on changing presser feet, needle plates, and feed dogs.

Spool Cap Usage

Instructions on how to correctly use the spool cap with thread spools.

Thread Anti-Spill Net Usage

Guidance on using the thread anti-spill net for synthetic threads.

Knee Lifter Installation

Steps for installing the knee lifter bracket under the table.

Fittings for Buttonhole Stitching

Components required for buttonhole stitching.

Fittings for Hem Sewing

Parts needed for sewing narrow hems.

Fittings for Zipper and Cord Sewing

Accessories for sewing zippers and cords.

Maintenance

Machine Head Cleaning

How to clean the machine head using a soft cloth.

Lubrication

Re-lubricating the machine if it has been idle.

Safety Inspection

Periodic checks of safety devices and components.

Troubleshooting

Parts List

Face Plate, Arm Top Cover and Arm Side Cover Components

Exploded view and list of parts for the face plate, arm top, and side covers.

Thread Take-up, Arm Shaft and Handwheel Components

Parts diagram and list for thread take-up, arm shaft, and handwheel.

Needle Bar, Presser Bar and Needle Plate Components

Exploded view and parts list for needle bar, presser bar, and needle plate.

Zigzag Triangular Cam and Hook Advancing Crank Components

Diagram and list of parts for zigzag triangular cam and hook advancing crank.

Bight Amplitude, and Bight L-C-R Position Components

Parts diagram and list for bight amplitude and position control components.

Arm Shaft (upright) and Rotating Hook Drive Shaft Components

Parts for the upright arm shaft and rotating hook drive shaft.

Hook and Bobbin Case Components

Diagram and list of parts for the hook and bobbin case.

Feed Regulating Dial and Feed Reverse Lever Components

Parts diagram for feed regulating dial and reverse lever.

Feed Mechanism Components

Parts list and diagram for the feed mechanism.

Presser Bar Lifter and Thread Tension Components

Parts for the presser bar lifter and thread tension mechanisms.

Thread Stand Components

Diagram and parts list for the thread stand.

Accessories and Attachments

List of various accessories and attachments for the sewing machine.

Belt Cover Components

Parts list and diagram for the belt cover assembly.

Singer 20U-105C Specifications

General IconGeneral
BrandSinger
Model20U-105C
CategorySewing Machine
LanguageEnglish

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